PHP Reference
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Quick Reference

The PHP json_encode() function is used to encode a value to JSON format.

<?php
$age = array('Johnny' => 11, 'Marty' => 56);
echo json_encode($age);
?>

Output

// encodes an associative array into a JSON object

Syntax

json_encode(value, options, depth)

Parameters

ParameterDescription
valueSpecifies the value to be encoded (required)
optionsSpecifies a bitmask:

  • JSON_FORCE_OBJECT

  • JSON_HEX_QUOT

  • JSON_HEX_TAG

  • JSON_HEX_AMP

  • JSON_HEX_APOS

  • JSON_INVALID_UTF8_IGNORE

  • JSON_INVALID_UTF8_SUBSTITUTE

  • JSON_NUMERIC_CHECK

  • JSON_PARTIAL_OUTPUT_ON_ERROR

  • JSON_PRESERVE_ZERO_FRACTION

  • JSON_PRETTY_PRINT

  • JSON_UNESCAPED_LINE_TERMINATORS

  • JSON_UNESCAPED_SLASHES

  • JSON_UNESCAPED_UNICODE

  • JSON_THROW_ON_ERROR

PHP Notes:

  • When using PHP, single or double quotation marks are acceptable and work identically to one another; choose whichever you prefer, and stay consistent
  • Arrays count starting from zero NOT one; so item 1 is position [0], item 2 is position [1], and item 3 is position [2] … and so on
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